ACC Programmer's Reference Guide

66 Chapter3

ZCOM Tables and Data Structures

Physical Terminal Tables

The physical terminal table (zptt_type) contains information used by the

LDM and DAM to initialize and control a physical terminal (or other

device). The PTT consists of a s ystem area, which is reserved for use by

the ZCOM subsystem, and a user area which may be manipulated by

application programs. The user modifiable portion of the PTT

immediately follows the reserved area. The layout of the PTT is shown in

Table 3-11 and Table 3-12.

Table 3-11 Physical Terminal Tables (System Area)

Field Name Field Description Field Type Size (Bytes)

PTZLU Owning terminal ZLU number uns.short 2

PTZCS Owning terminal ZLU checksum uns.short 2

PTMUX MUX number for this terminal uns.short 2

PTPORT Port number within interface uns.char 1

PTTERM Terminal number within port uns.char 1

PTMX_TERM Terminal number in card uns.short 2

SUBCH Subchannel number on port uns.short 2

PTZPRCVR ZCOM address of primary receiver struct 6

PTZPCTL_RCVR ZCOM address of primary control receiver struct 6

PTZSHRCVRS Pointer to list of shared receivers pointer 8

PTZSHCTLRCVRS Pointer to list of shared control receivers pointer 8

PTLIST Pointer to next PTT of same port pointer 8

PTTXLX Pointer to next PTT on express list pointer 8

PTTXQX Express transmit buffer queue struct 56

PTTXLA Pointer to next PTT on high priority list pointer 8

PTTXQA High priority transmit buffer queue struct 56

PTTXLB Pointer to next PTT on low priority list pointer 8

PTTXQB Low priority transmit buffer queue struct 56

PTTXQC Unacknowledged transmit buffer queue struct 56

PENDG_TXREQ Next request for $DATA struct 56

PTPZLK ZLU of next PTT on this port uns.short 2